One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,13)(15,16) involution — undirected(2,5)(6,8)(17,18,23,27)(19,28,20,25)(21,26,22,31)(24,30,32,29)(10,13)(14,16)(17,19,23,20)(18,24,27,32)(21,29,22,30)(25,31,28,26)(9,11,12,15)(10,14,13,16)(17,20,23,19)(18,25,27,28)(21,29,22,30)(24,31,32,26)(1,3,4,7)(2,6,5,8)(17,21,23,22)(18,26,27,31)(19,29,20,30)(24,25,32,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.